CN112440403A - Apparatus and method for producing expanded beads - Google Patents
Apparatus and method for producing expanded beads Download PDFInfo
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- CN112440403A CN112440403A CN202010875801.8A CN202010875801A CN112440403A CN 112440403 A CN112440403 A CN 112440403A CN 202010875801 A CN202010875801 A CN 202010875801A CN 112440403 A CN112440403 A CN 112440403A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 50
- 239000011324 bead Substances 0.000 title claims abstract description 43
- 238000005187 foaming Methods 0.000 claims abstract description 137
- 239000002245 particle Substances 0.000 claims abstract description 18
- 230000005587 bubbling Effects 0.000 claims description 30
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 6
- 239000006260 foam Substances 0.000 description 29
- 230000006870 function Effects 0.000 description 11
- 230000001276 controlling effect Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 230000003247 decreasing effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229920005992 thermoplastic resin Polymers 0.000 description 6
- 230000033228 biological regulation Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000004886 process control Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Molding Of Porous Articles (AREA)
- Flow Control (AREA)
- Control Of Temperature (AREA)
Abstract
The invention provides a device and a method for producing expanded particles. In order to achieve the purpose of accurately controlling the temperature in a foaming tank, in the apparatus for producing expanded beads of the present invention, a temperature adjustment control unit (10) comprises: a pressure reducing valve (12) for maintaining the pressure of the steam supplied to the jacket part (2) constant; branch pipes (11 a-11 c), the branch pipes (11 a-11 c) branching from the downstream side of the pressure reducing valve (12), the branch pipes (11 a-11 c) differing in the amount of steam supplied; an opening/closing valve switching control unit (21) for controlling the opening/closing switching of the branch pipes (11 a-11 c); and control valves (14b, 14c) that regulate the amount of vapor in the branch pipes (11b, 11 c).
Description
Technical Field
The present invention relates to an apparatus and a method for producing expanded beads.
Background
It is known that expanded beads comprising a thermoplastic resin are produced by a reduced pressure foaming method. In this vacuum foaming method, thermoplastic resin particles are dispersed in water containing a dispersant in a foaming tank, and then a volatile foaming agent is added to impregnate the thermoplastic resin particles with the volatile foaming agent while maintaining the thermoplastic resin particles at a high temperature and a high pressure, and then the thermoplastic resin particles are discharged in a low pressure atmosphere.
In the vacuum foaming method as a method for producing such expanded beads, in order to reduce the variation in expansion ratio of the expanded beads in each production lot, the following operations are performed: (a) reduced temperature variation within the foaming cell between production batches, and (b) higher accuracy of temperature control of the foaming cell within a batch (level of ± 0.1 ℃). Therefore, the temperature in the foaming tank is accurately adjusted from the temperature rise to the completion of foaming. Fig. 5 is a diagram schematically showing a schematic configuration of a conventional temperature regulation control unit for regulating the temperature in the foaming tank 1.
As shown in fig. 5, the conventional apparatus for producing expanded beads includes a foaming tank 1 and a temperature control unit 100. A sheath portion 2 is provided in the foam tank 1 so as to surround the outer peripheral portion of the foam tank 1. The conventional temperature control unit 100 includes a steam supply line 111 for supplying steam to the jacket 2. A pressure reducing valve 112, an opening/closing valve 113, and a control valve 114 are provided in the steam supply line 111 in this order from the upstream side to the downstream side (the side where the jacket portion 2 is located) of the steam supplied from the steam supply source. The pressure reducing valve 112 reduces the pressure of the high-pressure steam flowing from the steam supply source to maintain the vapor pressure supplied to the jacket portion 2 at a constant value. Further, the control valve 114 regulates the vapor flowing from the upstream side to a predetermined flow rate and sends the vapor to the downstream side. The control valve 114 is connected to a temperature indicating regulator (TIC). The temperature-indicating regulator receives a signal of the temperature in the foaming tank 1, and based on the signal, regulates the valve opening of the control valve 114 by using a process control method such as PID control. Thereby adjusting the flow rate of the vapor flowing in the vapor supply line 111. In this way, in the conventional configuration, the steam supply line 111 having a constant diameter (nominal diameter) is used to supply the steam of a constant pressure to the sheath portion 2 from the temperature rise of the foaming tank 1 to the foaming completion. Then, the temperature in the foaming tank 1 is adjusted by adjusting the supply amount of the steam at a constant pressure by the control valve 114.
Disclosure of Invention
Problems to be solved by the invention
In order to produce expanded beads having a small variation in expansion ratio in each production lot, it is important to accurately control the temperature in the foaming tank. The inside of the foaming tank 1 needs to be heated to 160 ℃ at maximum, and therefore, steam is supplied to the jacket portion 2 to heat it. Therefore, (a) only the temperature control of heating (no cooling) is performed, and (b) the heat capacity of the foaming tank 1 is large, so that the response delay time of the internal temperature measurement value of the foaming tank 1 in the temperature adjustment control portion 100 is long, and it is difficult to control the internal temperature with high accuracy. In the conventional apparatus shown in fig. 5, there is room for improvement in that the temperature in the foaming tank 1 is accurately controlled.
An object of one aspect of the present invention is to provide an apparatus and a method for producing foamed particles, which can accurately control the temperature in a foaming tank.
Means for solving the problems
In order to solve the above problems, an apparatus for producing expanded beads according to an aspect of the present invention includes: a foaming tank; a sheath portion provided on an outer peripheral portion of the foaming tank; and a temperature adjustment control unit having a supply pipe for supplying steam to the sheath unit and adjusting the temperature in the foaming tank, the temperature adjustment control unit including: a 1 st pressure reducing valve for keeping a pressure of the steam supplied to the sheath part constant; a plurality of branch pipes branching from a downstream side of the 1 st pressure reducing valve, the branch pipes having different amounts of vapor supplied; a switching control unit for controlling switching of opening and closing of the plurality of branch pipes; and a 1 st control valve provided in at least one of the plurality of branch pipes and configured to adjust an amount of steam in the branch pipe.
In order to solve the above problems, an apparatus for producing expanded beads according to an aspect of the present invention includes: a foaming tank; a sheath portion provided on an outer peripheral portion of the foaming tank; and a temperature adjustment control unit having a supply pipe for supplying steam to the sheath unit and adjusting the temperature in the foaming tank, the temperature adjustment control unit including: a 2 nd pressure reducing valve provided in the supply pipe, for reducing a pressure of the vapor supplied from the vapor supply source on the upstream side, and supplying the vapor to the downstream side; a 2 nd control valve provided on the supply pipe downstream of the 2 nd pressure reducing valve and configured to adjust a flow rate of the steam supplied to the sheath portion; and a pressure reducing valve pressure control unit that controls the 2 nd pressure reducing valve to increase or decrease the pressure of the steam flowing through the supply pipe.
In order to solve the above-mentioned problems, a method for producing expanded beads according to an aspect of the present invention is a method for producing expanded beads using a production apparatus including: a foaming tank; a sheath portion provided around the foaming tank; and a temperature adjustment control unit having a supply pipe for supplying steam to the sheath unit and adjusting the temperature in the foaming tank, the temperature adjustment control unit including: a 1 st pressure reducing valve for keeping a pressure of the steam supplied to the sheath part constant; a plurality of branch pipes branching from a downstream side of the 1 st pressure reducing valve, the branch pipes having different amounts of vapor supplied; and a 1 st control valve provided in at least one of the branch pipes, wherein the opening/closing of the branch pipes is controlled to be switched, and the amount of steam in the branch pipe provided with the 1 st control valve is adjusted by the 1 st control valve.
In order to solve the above-described problems, a method for producing expanded beads according to an aspect of the present invention is a method for producing expanded beads using a production apparatus including: a foaming tank; a sheath portion provided around the foaming tank; a temperature adjustment control unit that has a supply pipe for supplying steam to the sheath unit and adjusts the temperature in the foaming tank, the temperature adjustment control unit comprising: a 2 nd pressure reducing valve provided in the supply pipe, for reducing a pressure of the vapor supplied from the vapor supply source on the upstream side, and supplying the vapor to the downstream side; and a 2 nd control valve provided on the supply pipe downstream of the 2 nd pressure reducing valve, wherein the 2 nd pressure reducing valve is controlled to increase or decrease the pressure of the steam flowing through the supply pipe, and the flow rate of the steam to be supplied to the sheath portion is adjusted by the 2 nd control valve.
ADVANTAGEOUS EFFECTS OF INVENTION
According to one technical scheme of the invention, the temperature in the foaming tank can be accurately controlled.
Drawings
Fig. 1 is a schematic diagram showing a schematic configuration of an apparatus for producing expanded beads according to embodiment 1 of the present invention.
Fig. 2 is a graph showing an example of setting the internal temperature of the foaming tank in the foaming step, and control of switching the plurality of branch pipes in the manufacturing apparatus of embodiment 1 in accordance with the internal temperature setting.
Fig. 3 is a view schematically showing the schematic configuration of an apparatus for producing expanded beads according to embodiment 2 of the present invention.
Fig. 4 is a graph showing an example of setting the internal temperature of the foaming tank in the foaming step, and control of switching the plurality of branch pipes in the manufacturing apparatus of embodiment 2 in accordance with the internal temperature setting.
Fig. 5 is a schematic diagram showing a schematic configuration of a conventional apparatus for producing expanded beads.
Description of the reference numerals
1. A foaming tank; 2. a sheath portion; 10. 10A, a temperature regulation control part; 11. 11d, a supply pipe; 11a, 11b, 11c, branch pipes; 12. a pressure reducing valve (1 st pressure reducing valve); 15. a pressure reducing valve (2 nd pressure reducing valve); 13a, 13b, 13c, 13d, an opening and closing valve; 14b, 14c, a control valve (1 st control valve); 14d, a control valve (2 nd control valve); 21. an opening/closing valve switching control unit (switching control unit); 22. a pressure control section of the pressure reducing valve.
Detailed Description
[ embodiment mode 1 ]
An embodiment of the present invention will be described in detail below. Fig. 1 is a schematic diagram showing a schematic configuration of an apparatus for producing expanded beads according to the present embodiment.
As shown in fig. 1, the apparatus for producing expanded beads of the present embodiment includes a foaming tank 1, a sheath portion 2, and a temperature regulation control portion 10. The foaming tank 1 is not particularly limited as long as it is a conventionally known foaming tank used for producing foamed particles. The sheath portion 2 is provided to cover the outer peripheral portion of the foam tank 1 so as to be separated from the foam tank 1.
The temperature adjustment control unit 10 has a supply pipe 11 for supplying steam to the jacket 2. The steam supplied from the supply pipe 11 fills the space between the foaming tank 1 and the sheath portion 2. The inside of the foaming tank 1 is heated by the steam. The temperature regulation control unit 10 regulates the temperature in the foaming tank 1 by regulating the amount of steam supplied to the sheath unit 2. In the present embodiment, steam is used as the heating medium flowing through the supply pipe 11. However, the heating medium flowing through the supply pipe 11 is not limited to this, and other heating media, for example, oil, heated air, a mixed medium of steam and heated air, and the like can be used depending on the type of thermoplastic resin to be charged into the foam tank 1.
The temperature adjustment control unit 10 includes a supply pipe 11, a pressure reducing valve 12 (1 st pressure reducing valve), on-off valves 13a to 13c, a control valve 14b, and a control valve 14c (1 st control valve). The pressure reducing valve 12 is a valve for reducing the pressure of the high-pressure steam supplied from the steam supply source on the upstream side to an optimum pressure, and maintains the pressure of the steam supplied to the jacket portion 2 at a constant pressure.
The branch pipes 11a to 11c branch from the downstream side of the pressure reducing valve 12 in the supply pipe 11. The branch pipes 11a to 11c are configured to have different steam supply amounts. The branch pipes 11a to 11c are configured such that the steam supply amount increases in the order of the branch pipes 11a to 11 c. In the structure shown in FIG. 1, for example, the volume of the foam tank 1 is 2 to 4m3The nominal diameter of the branch pipe 11a was 50A (outer diameter: 60.5mm), the nominal diameter of the branch pipe 11b was 25A (outer diameter: 34.0mm), and the nominal diameter of the branch pipe 11c was 15A (outer diameter: 21.7 mm).
The opening/closing valve 13a is a valve for switching the opening/closing of the branch pipe 11a, the opening/closing valve 13b is a valve for switching the opening/closing of the branch pipe 11b, and the opening/closing valve 13c is a valve for switching the opening/closing of the branch pipe 11 c. In the manufacturing apparatus of the present embodiment, 3 branch pipes having different steam supply amounts are branched into the supply pipe 11 on the downstream side of the pressure reducing valve 12. The opening and closing of branch pipe 11a is switched by opening and closing valve 13a, the opening and closing of branch pipe 11b is switched by opening and closing valve 13b, and the opening and closing of branch pipe 11c is switched by opening and closing valve 13 c.
In the manufacturing apparatus of the present embodiment, the amount of steam supplied to each of the branch pipes 11a to 11c is adjusted. The control valve 14b has a connection diameter corresponding to the nominal diameter of the branch pipe 11b, and the control valve 14b is connected to the branch pipe 11b, and the control valve 14c has a connection diameter corresponding to the nominal diameter of the branch pipe 11c, and the control valve 14c is connected to the branch pipe 11 c. The control valve 14b is a valve for adjusting the amount of vapor in the branch pipe 11b, and the control valve 14c is a valve for adjusting the amount of vapor in the branch pipe 11 c. The control valves 14b and 14c are feedback-controlled based on the measured values of the temperature in the bubbling tank 1 or the jacket 2. The control valve 14b adjusts the amount of the steam flowing through the branch pipe 11b based on the measurement value or the like fed back to the control valve 14b, and the control valve 14c adjusts the amount of the steam flowing through the branch pipe 11c based on the measurement value or the like fed back to the control valve 14 c. Specifically, the control valve 14b and the control valve 14c are connected to a temperature indicating regulator (TIC), respectively. The temperature indicating regulator is given data of a set temperature in the foaming tank 1, and measures temperature data in the foaming tank 1. The temperature-indicating regulator controls the valve opening degree of the control valve 14b and/or the control valve 14c by a process control method such as PID control based on the two signals of the set temperature data and the measured temperature data so that the temperature in the foaming tank 1 becomes the set temperature. Thereby adjusting the flow rate of the vapor flowing through the branch pipe 11b and/or the branch pipe 11 c. In addition, a control valve is not provided in the branch pipe 11a having the largest steam supply amount.
The manufacturing apparatus of the present embodiment includes an opening/closing valve switching control unit 21 (switching control unit). The opening/closing valve switching control unit 21 controls the opening/closing switching of the opening/closing valves 13a to 13 c. The on-off valve switching control unit 21 controls the on-off switching of the on-off valves 13a to 13c in accordance with the temperature in the foaming tank 1 in the foaming step. Since the opening and closing of the branch pipes 11a to 11c are switched by the opening/closing valve switching control unit 21, the amount of steam supplied to the sheath unit 2 changes in accordance with the switching.
(control of the amount of steam supplied by the on-off valve switching control section 21)
In the manufacturing apparatus of the present embodiment, the range of the amount of steam supplied to the sheath unit 2 is controlled by the opening/closing valve switching control unit 21. The method for producing expanded beads according to the present embodiment is a method using the production apparatus shown in fig. 1, in which the opening and closing of the plurality of branch pipes 11a to 11c are controlled to be switched, and the amounts of steam in the branch pipes 11b and 11c are adjusted by the control valves 14b and 14 c. In addition, by such a control method, the temperature in the foaming tank 1 from the temperature rise in the foaming tank 1 to the completion of foaming in the foaming step can be accurately controlled.
The control of the amount of steam supplied by the on-off valve switching control unit 21 will be described with reference to fig. 2. Fig. 2 is a graph showing an example of setting the internal temperature of the foaming tank 1 in the foaming step, and switching control of the branch pipes 11a to 11c corresponding to the internal temperature setting. In fig. 2, the diameter of the branch pipe 11a is D1, the diameter of the branch pipe 11b is D2, and the diameter of the branch pipe 11c is D3. The diameters D1-D3 are D1> D2> D3.
First, the on-off valve switching control unit 21 opens only the on-off valve 13a to start the temperature rise of the bubble tank 1. Thereby, the steam flows into the sheath portion 2 only through the branch pipe 11 a. At this time, the bore D1 of the branch pipe 11a is the largest bore among the bores of the branch pipes 11a to 11 c. Therefore, the steam supply amount to the jacket portion 2 is maximized. Therefore, the maximum amount of steam is continuously supplied to the sheath portion 2 via the branch pipe 11 a. This enables the temperature in the foam tank 1 to rise rapidly (the rate of rise of the internal temperature of the foam tank 1: slope S1).
Next, after the temperature in the bubbling tank 1 reaches the predetermined set temperature T1, the on-off valve switching control unit 21 controls the on-off valve switching control unit 21 at a predetermined timing so that the on-off valve 13a is closed and only the on-off valve 13b is opened. At this time, the steam flows into the sheath portion 2 only through the branch pipe 11 b. The temperature indicating regulator (TIC) regulates the valve opening degree of the control valve 14b so that the temperature in the bubbling tank 1 reaches the set temperature T2 from the set temperature T1. The amount of steam supplied to the jacket portion 2 is adjusted by adjusting the control valve 14 b. Since the diameter D2 of the branch pipe 11b is smaller than the diameter D1 of the branch pipe 11a, the steam supply rate to the sheath portion 2 decreases. In such a state where the steam supply rate is decreased, in order to make the temperature in the foam tank 1 reach the set temperature T2 so as not to exceed the set temperature T2, the temperature indication regulator (TIC) is given a set value of the temperature in the foam tank 1 such that the set value of the temperature in the foam tank 1 shows two broken lines having different internal temperature increase rates (the internal temperature increase rates of the foam tank 1: slopes S2 and S2 ', the magnitude of the slopes: S2> S2'). Further, a temperature indication regulator (TIC) adjusts the valve opening degree of the control valve 14b based on the measured value of the temperature in the foaming tank 1 so that the temperature in the foaming tank 1 follows the set value of the folding line, thereby adjusting the amount of steam supplied to the jacket portion 2. By adjusting the steam supply amount in this manner, the temperature in the bubbling tank 1 can be gradually increased from the set temperature T1 to reach the target set temperature T2.
After the temperature in bubble tank 1 reaches set temperature T2, opening/closing valve switching control unit 21 controls opening/closing valve 13b to be closed and opening only opening/closing valve 13c to be opened at a predetermined timing. At this time, the steam flows into the sheath portion 2 only through the branch pipe 11 c. The temperature indicating regulator (TIC) regulates the valve opening degree of the control valve 14c so that the temperature in the bubbling tank 1 reaches the set temperature T3 from the set temperature T2. The amount of steam supplied to the jacket portion 2 is adjusted by adjusting the control valve 14 c. Since the diameter D3 of the branch pipe 11c is smaller than the diameter D2 of the branch pipe 11b, the steam supply rate to the sheath portion 2 is further decreased. In such a state where the steam supply rate is decreased, in order to make the temperature in the bubbling tank 1 reach the target set temperature T3 so as not to exceed the target set temperature T3, a temperature indicating regulator (TIC) is given a set value of the temperature in the bubbling tank 1 in such a manner that the set value of the temperature in the bubbling tank 1 appears as a straight line going from the set temperature T2 to the set temperature T3. Further, the temperature indication regulator (TIC) adjusts the valve opening degree of the control valve 14c based on the measured value of the temperature in the bubbling tank 1 so that the temperature in the bubbling tank 1 follows a straight line from the set temperature T2 to the set value of the target set temperature T3, thereby adjusting the amount of steam supplied to the jacket portion 2. By adjusting the amount of steam supplied in this manner, the temperature in the foaming tank 1 can be brought to the target set temperature T3 (the rate of increase in the internal temperature of the foaming tank 1: slope S3).
In this way, the opening/closing valve switching control unit 21 is configured to sequentially switch the opening/closing of the branch pipe 11a having the largest vapor supply amount to the branch pipe 11c having the smallest vapor supply amount. This makes it possible to accurately and reproducibly adjust the temperature in the foam tank 1 from the set temperature T1 to the set temperature T3. According to the manufacturing apparatus of the present embodiment, the temperature in the foaming tank 1 can be accurately controlled within a range of 160 ℃ to ± 0.1 ℃.
As described above, in the manufacturing apparatus of the present embodiment, the temperature in the bubbling tank 1 can be controlled to the set temperatures T1, T2, and T3 in 3 stages by controlling the switching of the open/close valves 13a to 13c by the open/close valve switching controller 21. Therefore, according to the manufacturing apparatus of the present embodiment, the temperature in the foaming tank 1 can be controlled with higher accuracy and higher reproducibility than in the conventional manufacturing apparatus.
In the configuration shown in fig. 1, the supply pipe 11 has 3 branch pipes 11a to 11 c. However, in the manufacturing apparatus of the present embodiment, the number of the branch pipes may be plural, and the number of the branch pipes may be appropriately set according to the size (capacity) of the foaming tank 1 or the method and accuracy of temperature control in the foaming tank 1 in the foaming step. The nominal diameter for defining the steam supply amount of the branch pipes 11a to 11c is not limited to the configuration shown in fig. 1, and can be set appropriately according to the size of the foam tank 1 or the accuracy of temperature control in the foam tank 1 in the foaming step.
The control valve of the present embodiment may be provided in at least 1 of the branch pipes 11a to 11 c. For example, the branch pipe 11a used in the initial stage of temperature rise in the foam generating tank 1 may be provided with a control valve, or may not be provided with a control valve as shown in fig. 1. The presence or absence of the setting of the control valve can be appropriately set in accordance with the structure of the branch pipe or the temperature control operation in the foaming tank 1. The control valves 14b and 14c may be conventionally known control valves. The control valves 14b and 14c are not limited to the configuration in which feedback is performed from data of the temperature measurement value in the bubble tank 1.
The on-off valve switching control unit 21 controls switching of the on-off valves 13a to 13 c. The switching operation of the opening/closing valve switching control unit 21 is not limited to the operation of sequentially switching the opening/closing from the branch pipe 11a to the branch pipe 11 c. For example, the on-off valve switching control unit 21 may control two on-off valves out of the on-off valves 13a to 13c to be opened and the remaining on-off valves to be closed. In this case, the on-off valve switching control unit 21 may perform control by changing the degree of opening of the two on-off valves. For example, the open-close valve switching control portion 21 controls the two open-close valves such that one open-close valve is opened by 100% and the other open-close valve is opened by 25%.
The on-off valve switching control unit 21 may be configured by an element or a member capable of controlling switching of the on-off valves 13a to 13 c. For example, the on-off valve switching control unit 21 may have the following functions: a function of measuring the temperature in the foam tank 1, a control function of controlling the temperature in the foam tank 1 to a predetermined temperature when the measured temperature exceeds or falls below the predetermined temperature (for example, a set temperature T1, T2, or T3), and a notification function of notifying a user that the temperature in the foam tank 1 has reached the predetermined temperature.
The on-off valve switching control unit 21 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software using a CPU (central processing unit). By providing such an opening/closing valve switching control unit 21, the opening/closing switching control of the opening/closing valves 13a to 13c can be automated.
In this case, the manufacturing apparatus of the present embodiment includes a CPU that executes a command as a program of software for realizing each function, a ROM (read only memory) or a storage device (these are referred to as "recording medium") that records the program and various data so as to be readable by a computer (or CPU), a RAM (random access memory) that develops the program, and the like. The object of the present disclosure can be achieved by a computer (or CPU) reading and executing the program from the recording medium. As the above-mentioned recording medium, "non-transitory tangible medium" such as a magnetic tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer through an arbitrary transmission medium (a communication network, a broadcast wave, or the like) through which the program can be transmitted. The present invention can also be realized as a data signal embedded in a carrier wave, the program being embodied by electronic transmission.
[ embodiment 2 ]
Other embodiments of the present invention will be described below. For convenience of description, members having the same functions as those described in the above embodiments are given the same reference numerals, and description thereof will not be repeated. Fig. 3 is a schematic diagram showing a schematic configuration of an apparatus for producing expanded beads according to the present embodiment.
As shown in fig. 3, the manufacturing apparatus of the present embodiment is different from embodiment 1 in that a supply pipe for supplying steam to the jacket portion 2 is not branched. In this manufacturing apparatus, the temperature adjustment control unit 10A has only 1 supply pipe 11 d. The nominal diameter of the supply tube 11d is 80A (outer diameter: 89.1 mm).
The temperature adjustment control portion 10A includes a pressure reducing valve 15 (2 nd pressure reducing valve), an opening/closing valve 13d, and a control valve 14d (2 nd control valve). A pressure reducing valve 15, an opening/closing valve 13d, and a control valve 14d are provided in the supply pipe 11d in this order from the upstream side to the downstream side (the jacket portion 2 side) of the vapor supply source. The pressure reducing valve 15 is a valve that reduces the pressure of the steam supplied from the upstream steam supply source and supplies the steam to the downstream side. The opening/closing valve 13d is a valve for opening/closing the supply pipe 11 d.
The control valve 14d is provided on the supply pipe 11d downstream of the pressure reducing valve 15 and is a valve for adjusting the flow rate of the steam supplied to the sheath portion 2. The control valve 14d is feedback-controlled based on a measured value of the temperature in the foaming tank 1 or the jacket portion 2. The control valve 14d adjusts the amount of vapor flowing in the supply pipe 11d based on the measurement value or the like fed back to the control valve 14 d. Specifically, the control valve 14d is connected to a temperature indicating regulator (TIC). The temperature indicating regulator is given data of a set temperature in the foaming tank 1, and measures temperature data in the foaming tank 1. The temperature-indicating regulator controls the valve opening of the control valve 14d by a process control method such as PID control based on the two signals of the set temperature data and the measured temperature data so that the temperature in the foaming tank 1 becomes the set temperature. Thereby adjusting the flow rate of the vapor flowing in the supply pipe 11 d.
The manufacturing apparatus of the present embodiment includes a pressure reducing valve pressure control unit 22. The pressure reducing valve pressure control unit 22 controls the pressure reducing valve 15 to increase or decrease the pressure of the steam flowing through the supply pipe 11 d. The pressure-reducing valve pressure control unit 22 changes the supply rate of the steam to the jacket unit 2. Then, the amount of steam supplied to the sheath portion 2 changes in accordance with the change.
(control of the amount of steam supply by the pressure control section 22 of the pressure reducing valve)
In the manufacturing apparatus of the present embodiment, the steam supply pressure to the sheath portion 2 is controlled by the pressure reducing valve pressure control portion 22. The method for producing expanded beads according to the present embodiment is a method using the production apparatus shown in fig. 3, in which the pressure of the steam flowing through the supply pipe 11d is increased or decreased by setting the pressure with the pressure reducing valve 15, and the flow rate of the steam supplied to the sheath portion 2 is adjusted by the control valve 14 d. By such control, the temperature in the foaming tank 1 in the foaming step can be accurately controlled.
The control of the vapor supply amount by the pressure reducing valve pressure control portion 22 will be described with reference to fig. 4. Fig. 4 is a diagram showing an example of a temporal change in the internal temperature of the foaming tank 1 in the foaming step, and the set pressure switching control of the pressure reducing valve 15 according to the temporal change. In fig. 4, the pressure reducing valve pressure controller 22 sets the set pressure of the pressure reducing valve 15 to 3 pressures P1, P2, and P3. The set pressures P1 to P3 are P1> P2> P3.
First, the pressure reducing valve pressure control unit 22 controls the pressure reducing valve 15 so that the pressure of the steam flowing through the supply pipe 11d becomes the set pressure P1. Thereby, the steam having the set pressure P1 flows through the supply pipe 11d to the jacket 2. At this time, steam at the set pressure P1 is continuously supplied to the sheath portion 2, and the temperature in the foaming tank 1 is increased to the set temperature T1 (the rate of increase in the internal temperature of the foaming tank 1: slope S1).
Next, after the temperature in the bubbling tank 1 reaches the predetermined set temperature T1, the pressure-reducing-valve-pressure control unit 22 controls the pressure-reducing valve 15 at a predetermined timing so that the pressure of the steam flowing through the supply pipe 11d becomes the set pressure P2 lower than the set pressure P1. The temperature indicating regulator (TIC) regulates the valve opening degree of the control valve 14d so that the temperature in the bubbling tank 1 reaches the set temperature T2 from the set temperature T1. The amount of steam supplied to the jacket portion 2 is adjusted by adjusting the control valve 14 d. At this time, the pressure of the steam supplied to the jacket portion 2 becomes the set pressure P2 lower than the set pressure P1, and therefore the steam supply rate to the jacket portion 2 decreases. In such a state where the steam supply rate is decreased, in order to make the temperature in the foam tank 1 reach the set temperature T2 so as not to exceed the set temperature T2, the temperature indication regulator (TIC) is given a set value of the temperature in the foam tank 1 such that the set value of the temperature in the foam tank 1 shows two broken lines having different internal temperature increase rates (the internal temperature increase rates of the foam tank 1: slopes S2 and S2 ', the magnitude of the slopes: S2> S2'). Further, a temperature indication regulator (TIC) adjusts the valve opening degree of the control valve 14d based on the measured value of the temperature in the foaming tank 1 so that the temperature in the foaming tank 1 follows the set value of the folding line, thereby adjusting the amount of steam supplied to the jacket portion 2. By adjusting the steam supply amount in this manner, the temperature in the foaming tank 1 can be gradually increased to the set temperature T1, and can reach the target set temperature T2.
After the temperature in the bubbling tank 1 reaches the set temperature T2, the pressure-reducing-valve-pressure control unit 22 controls the pressure-reducing valve 15 at a predetermined timing so that the pressure of the steam flowing through the supply pipe 11d becomes the set pressure P3 lower than the set pressure P2. The temperature indicating regulator (TIC) regulates the valve opening degree of the control valve 14d so that the temperature in the bubbling tank 1 reaches the set temperature T3 from the set temperature T2. The amount of steam supplied to the jacket portion 2 is adjusted by adjusting the control valve 14 d. At this time, the pressure of the steam supplied to the jacket portion 2 becomes the set pressure P3 lower than the set pressure P2, and therefore the steam supply rate to the jacket portion 2 further decreases. In such a state where the steam supply rate is decreased, in order to make the temperature in the bubbling tank 1 reach the set temperature T3 so as not to exceed the set temperature T3, a temperature indicating regulator (TIC) is given a set value of the temperature in the bubbling tank 1 in such a manner that the set value of the temperature in the bubbling tank 1 appears as a straight line from the set temperature T2 to the set temperature T3. Further, the temperature indication regulator (TIC) adjusts the valve opening degree of the control valve 14d based on the measured value of the temperature in the bubbling tank 1 so that the temperature in the bubbling tank 1 follows a straight line from the set temperature T2 to the set value of the target set temperature T3, thereby adjusting the amount of steam supplied to the jacket portion 2. By adjusting the amount of steam supplied in this manner, the temperature in the foaming tank 1 can be brought to the target set temperature T3 (the rate of increase in the internal temperature of the foaming tank 1: slope S3).
In this way, the pressure reducing valve pressure control unit 22 is configured to gradually decrease the vapor pressure from the set pressure P1 to P3. Thus, by providing the slopes of the set temperatures in the foam tank 1 with S1, S2, S2' and S3, the temperature in the foam tank 1 can be raised to T1, T2 and T3 in 3 stages. Therefore, according to the manufacturing apparatus of the present embodiment, the temperature in the foaming tank 1 can be controlled with higher accuracy and higher reproducibility than in the conventional manufacturing apparatus.
The control valve 14d may be a conventionally known control valve. The control valves 14b and 14c are not limited to the configuration in which feedback is performed from data of the temperature measurement value in the bubble tank 1. The number of stages of the pressure control of the pressure reducing valve may be continuously changed without being limited. The set temperature and the slope of the foaming tank 1 are not limited.
The pressure reducing valve pressure control unit 22 controls the pressure reducing valve 15. Therefore, the pressure reducing valve pressure control unit 22 may be constituted by an element or a member capable of controlling the pressure reducing valve 15. For example, the pressure reducing valve pressure control unit 22 may have a structure having the following functions: a measurement function of measuring the pressure of the supply pipe 11d, a control function of controlling the pressure of the supply pipe 11d to a predetermined pressure (for example, a set pressure P1, P2, or P3) when the measured pressure exceeds or falls below the predetermined pressure, and a notification function of notifying a user that the pressure of the supply pipe 11d reaches the predetermined pressure.
The pressure-reducing valve pressure control unit 22 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software using a CPU (central processing unit). By providing such a pressure reducing valve pressure control unit 22, automatic control of the pressure reducing valve 15 can be realized.
In this case, the manufacturing apparatus of the present embodiment includes a CPU that executes a command as a program of software for realizing each function, a ROM (read only memory) or a storage device (these are referred to as "recording medium") that records the program and various data so as to be readable by a computer (or CPU), a RAM (random access memory) that develops the program, and the like. The object of the present disclosure can be achieved by a computer (or CPU) reading and executing the program from the recording medium. As the above-mentioned recording medium, "non-transitory tangible medium" such as a magnetic tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer through an arbitrary transmission medium (a communication network, a broadcast wave, or the like) through which the program can be transmitted. The present invention can also be realized as a data signal embedded in a carrier wave, the program being embodied by electronic transmission.
The nominal diameter for defining the steam supply amount of the supply pipe 11d is not limited to the configuration shown in fig. 3, and can be appropriately set in accordance with the size of the foaming tank 1 or the temperature control in the foaming tank 1 in the foaming step.
The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the respective embodiments are also included in the technical scope of the present invention.
[ conclusion ]
The apparatus for producing expanded beads according to claim 1 of the present invention has a structure including: a foaming tank 1; a sheath portion 2 provided on an outer peripheral portion of the foam tank 1; and a temperature adjustment control unit 10 that has a supply pipe 11 for supplying steam to the sheath unit 2 and adjusts the temperature in the foaming tank 1, the temperature adjustment control unit 10 including: a 1 st pressure reducing valve (pressure reducing valve 12) for maintaining a pressure of the steam supplied to the jacket portion 2 constant; a plurality of branch pipes 11a to 11c, the plurality of branch pipes 11a to 11c branching from a downstream side of the 1 st pressure reducing valve, and the plurality of branch pipes 11a to 11c having different amounts of vapor supplied; a switching control unit (opening/closing valve switching control unit 21) for controlling opening/closing switching of the plurality of branch pipes 11a to 11 c; and a 1 st control valve (control valves 14b and 14c) provided in at least one of the branch pipes 11a to 11c and adjusting the amount of steam in the branch pipe.
Further, according to claim 1, the apparatus for producing expanded beads according to claim 2 of the present invention is configured such that the 1 st control valve is not provided in the branch pipe 11a having the largest steam supply amount.
Further, according to claim 1 or 2, the apparatus for producing expanded beads according to claim 3 of the present invention is configured such that the switching controller (opening/closing valve switching controller 21) is configured to sequentially switch the opening/closing of the branch pipe 11a having the largest vapor supply amount to the branch pipe 11c having the smallest vapor supply amount.
Further, according to claim 1 or 2, the apparatus for producing expanded beads according to claim 4 of the present invention is configured such that the 1 st control valve is feedback-controlled based on a measured value of the temperature in the expansion tank 1 or the sheath portion 2, and the 1 st control valve adjusts the amount of steam flowing through the branch pipes 11b and 11c based on the measured value fed back to the 1 st control valve.
Further, according to claim 4, the apparatus for producing expanded beads according to claim 5 of the present invention has a configuration in which the apparatus for producing expanded beads has a temperature indication regulator (TIC) which is connected to the 1 st control valve and to which data of a set temperature in the expansion tank 1 is given, and which measures temperature data in the expansion tank 1, and the temperature indication regulator controls a valve opening degree of the 1 st control valve by PID control based on two signals of the data of the set temperature and the measured temperature data so that the temperature in the expansion tank 1 becomes the set temperature.
Further, according to claim 5, the apparatus for producing expanded beads according to claim 6 of the present invention is configured such that the plurality of branch pipes are constituted by the 1 st to 3 rd branch pipes 11a to 11c having different diameters, the 1 st branch pipe 11a > the 2 nd branch pipe 11b > the 3 rd branch pipe 11c are provided with respect to the diameters D1 to D3 of the branch pipes 11a to 11c, the 1 st control valve is not provided in the 1 st branch pipe 11a, and the switching controller performs the steps of: (1) opening only the 1 st branch pipe 11a to start warming up of the bubbling tank 1, (2) opening only the 2 nd branch pipe 11b after the temperature in the bubbling tank 1 reaches the 1 st set temperature T1, (3) opening only the 3 rd branch pipe 11c after the temperature in the bubbling tank 1 reaches the 2 nd set temperature T2 from the 1 st set temperature T1 to bring the temperature in the bubbling tank 1 to the target 3 rd set temperature T3, the temperature indicating regulator (TIC) being given a set value of the temperature in the bubbling tank 1 in such a manner that, based on a graph of the relationship between the time from the step (1) to the step (3) and the set temperature in the bubbling tank 1: the set value of the temperature in the foaming tank 1 is represented by two broken lines having different internal temperature rising speeds in the range between the 1 st set temperature T1 and the 2 nd set temperature T2, and the set value of the temperature in the foaming tank 1 is represented by a straight line from the 2 nd set temperature T2 to the 3 rd set temperature T3 in the range between the 2 nd set temperature T2 and the 3 rd set temperature T3.
The apparatus for producing expanded particles according to claim 7 of the present invention has a structure including: a foaming tank 1; a sheath portion 2 provided on an outer peripheral portion of the foam tank 1; and a temperature adjustment control unit 10A having a supply pipe 11d for supplying steam to the sheath unit 2 and adjusting the temperature in the foaming tank, the temperature adjustment control unit 10A including: a 2 nd pressure reducing valve (pressure reducing valve 15) provided in the supply pipe 11d, for reducing the pressure of the vapor supplied from the vapor supply source on the upstream side and supplying the vapor to the downstream side; a 2 nd control valve (control valve 14d) provided on the supply pipe 11d downstream of the 2 nd pressure reducing valve and configured to adjust the flow rate of the steam to be supplied to the jacket portion 2; and a pressure reducing valve pressure control unit 22 that controls the 2 nd pressure reducing valve to increase or decrease the pressure of the steam flowing through the supply pipe.
According to claim 7, the apparatus for producing expanded beads according to claim 8 of the present invention is configured such that the 2 nd control valve is feedback-controlled based on a measured value of the temperature in the expansion tank 1 or the sheath portion 2, and the 2 nd control valve adjusts the amount of steam flowing through the supply pipe 11d based on the measured value fed back to the 2 nd control valve.
According to claim 8, the apparatus for producing foamed beads according to claim 9 of the present invention is configured to include a temperature indication regulator (TIC) that is connected to the 2 nd control valve and that is provided with data of a set temperature in the foaming tank 1 to measure temperature data in the foaming tank 1, wherein the temperature indication regulator controls a valve opening degree of the 2 nd control valve by PID control so that the temperature in the foaming tank 1 becomes the set temperature based on two signals of the data of the set temperature and the measured temperature data.
According to claim 9, the apparatus for producing expanded beads according to claim 10 of the present invention is configured such that the pressure-reducing-valve-pressure control unit 22 sets the set pressure of the 2 nd pressure-reducing valve 15 to the 1 st set pressure P1 to the 3 rd set pressure P3, and the 1 st set pressure P1> the 2 nd set pressure P2> the 3 rd set pressure P3 regarding the magnitude of each pressure, and the pressure-reducing-valve-pressure control unit 22 performs the steps of: (1) controlling the 2 nd pressure reducing valve 15 so that the pressure of the steam flowing in the supply pipe 11d becomes the 1 st set pressure P1, (2) after the temperature in the bubbling tank 1 reaches the 1 st set temperature T1, controlling the 2 nd pressure reducing valve 15 so that the pressure of the steam flowing in the supply pipe 11d becomes the 2 nd set pressure P2, (3) after the temperature in the bubbling tank 1 reaches the 2 nd set temperature T2 from the 1 st set temperature T1, controlling the 2 nd pressure reducing valve 15 so that the pressure of the steam flowing in the supply pipe 11d becomes the 3 rd set pressure P3, so that the temperature in the bubbling tank 1 reaches a target 3 rd set temperature T3, based on a graph of the relationship between the time from the step (1) to the step (3) and the set temperature in the tank 1, the temperature indicating regulator (TIC) is given a set value of the temperature in the foaming tank 1 in the following manner: the set value of the temperature in the foaming tank 1 is represented by two broken lines having different internal temperature rising speeds in the range between the 1 st set temperature T1 and the 2 nd set temperature T2, and the set value of the temperature in the foaming tank 1 is represented by a straight line from the 2 nd set temperature T2 to the 3 rd set temperature T3 in the range between the 2 nd set temperature T2 and the 3 rd set temperature T3.
The method for producing expanded beads according to claim 11 of the present invention uses a production apparatus comprising: a foaming tank 1; a sheath portion 2 provided on an outer peripheral portion of the foam tank 1; and a temperature adjustment control unit 10 that has a supply pipe 11 for supplying steam to the sheath unit 2 and adjusts the temperature in the foaming tank 1, the temperature adjustment control unit 10 including: a 1 st pressure reducing valve (pressure reducing valve 12) for maintaining a pressure of the steam supplied to the jacket portion 2 constant; a plurality of branch pipes 11a to 11c, the plurality of branch pipes 11a to 11c branching from a downstream side of the 1 st pressure reducing valve, and the plurality of branch pipes 11a to 11c having different amounts of vapor supplied; and a 1 st control valve (control valves 14b and 14c) provided in at least one of the branch pipes 11a to 11c, wherein the opening/closing switching of the branch pipes 11a to 11c is controlled, and the amount of steam in the branch pipes 11b and 11c is adjusted by the 1 st control valve.
The method for producing expanded beads according to claim 12 of the present invention uses a production apparatus comprising: a foaming tank 1; a sheath portion 2 provided on an outer peripheral portion of the foam tank 1; a temperature adjustment control unit 10A having a supply pipe 11d for supplying steam to the jacket portion 2 and adjusting the temperature in the foaming tank 1, the temperature adjustment control unit 10A including: a 2 nd pressure reducing valve (pressure reducing valve 15) provided in the supply pipe 11d, for reducing the pressure of the vapor supplied from the vapor supply source on the upstream side and supplying the vapor to the downstream side; and a 2 nd control valve provided on the supply pipe 11d downstream of the 2 nd pressure reducing valve, wherein the 2 nd pressure reducing valve is controlled to increase or decrease the pressure of the steam flowing through the supply pipe 11d, and the flow rate of the steam to be supplied to the sheath portion 2 is adjusted by the 2 nd control valve.
The present invention is not limited to the above embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining the technical means disclosed in the respective embodiments are also included in the technical scope of the present invention. Further, by combining the technical means disclosed in the respective embodiments, new technical features can be formed.
Claims (12)
1. An apparatus for producing expanded beads, wherein,
the apparatus for producing expanded beads comprises:
a foaming tank;
a sheath portion provided on an outer peripheral portion of the foaming tank; and
a temperature adjustment control unit having a supply pipe for supplying steam to the sheath unit and adjusting the temperature in the foaming tank,
the temperature adjustment control unit includes:
a 1 st pressure reducing valve for keeping a pressure of the steam supplied to the sheath part constant;
a plurality of branch pipes branching from a downstream side of the 1 st pressure reducing valve, the branch pipes having different amounts of vapor supplied;
a switching control unit for controlling switching of opening and closing of the plurality of branch pipes; and
and a 1 st control valve provided in at least one of the plurality of branch pipes and configured to adjust an amount of the steam in the branch pipe.
2. The apparatus for producing expanded particles according to claim 1, wherein,
the 1 st control valve is not provided in the branch pipe having the largest vapor supply amount among the plurality of branch pipes.
3. The apparatus for producing expanded particles according to claim 1 or 2, wherein,
the switching control unit is configured to sequentially switch the opening and closing of the branch pipe having the largest steam supply amount to the branch pipe having the smallest steam supply amount.
4. The apparatus for producing expanded particles according to claim 1 or 2, wherein,
feedback-controlling the 1 st control valve based on a measured value of the temperature in the foaming tank or the jacket portion,
the 1 st control valve adjusts the amount of vapor flowing in the branch pipe based on the measurement value fed back to the 1 st control valve.
5. The apparatus for producing expanded particles according to claim 4, wherein,
the apparatus for producing foamed particles has a temperature indicating regulator (TIC) connected to the 1 st control valve and to which data on a set temperature in the foaming tank is given, and measures temperature data in the foaming tank,
the temperature indication regulator controls the valve opening of the 1 st control valve by PID control based on two signals of the data of the set temperature and the measured temperature data so that the temperature in the foaming tank becomes the set temperature.
6. The apparatus for producing expanded particles according to claim 5, wherein,
the plurality of branch pipes are composed of a 1 st branch pipe to a 3 rd branch pipe having different calibers, and regarding the calibers of the branch pipes, the 1 st branch pipe > the 2 nd branch pipe > the 3 rd branch pipe,
the 1 st control valve is not provided in the 1 st branch pipe,
the switching control unit performs the steps of:
(1) opening only the 1 st branch pipe to start the temperature rise of the foaming tank,
(2) after the temperature in the foaming tank reaches the 1 st set temperature, only the 2 nd branch pipe is opened,
(3) after the temperature in the foaming tank reaches the 2 nd set temperature from the 1 st set temperature, only the 3 rd branch pipe is opened to make the temperature in the foaming tank reach the 3 rd set temperature,
based on a graph of the relationship between the time from the step (1) to the step (3) and the set temperature in the foaming tank, the temperature indication regulator (TIC) is given a set value of the temperature in the foaming tank in the following manner:
in the range between the 1 st set temperature and the 2 nd set temperature, the set value of the temperature in the foaming tank is represented by two fold lines having different internal temperature rise speeds,
in the range between the 2 nd set temperature and the 3 rd set temperature, the set value of the temperature in the foaming tank is expressed as a straight line from the 2 nd set temperature to the 3 rd set temperature.
7. An apparatus for producing expanded beads, wherein,
the apparatus for producing expanded beads comprises:
a foaming tank;
a sheath portion provided on an outer peripheral portion of the foaming tank; and
a temperature adjustment control unit having a supply pipe for supplying steam to the sheath unit and adjusting the temperature in the foaming tank,
the temperature adjustment control unit includes:
a 2 nd pressure reducing valve provided in the supply pipe, for reducing a pressure of the vapor supplied from the vapor supply source on the upstream side, and supplying the vapor to the downstream side;
a 2 nd control valve provided on the supply pipe downstream of the 2 nd pressure reducing valve and configured to adjust a flow rate of the steam supplied to the sheath portion; and
and a pressure reducing valve pressure control unit that controls the 2 nd pressure reducing valve to increase or decrease the pressure of the steam flowing through the supply pipe.
8. The apparatus for producing expanded particles according to claim 7, wherein,
feedback-controlling the 2 nd control valve based on a measured value of the temperature in the foaming tank or the jacket portion,
the 2 nd control valve adjusts the amount of vapor flowing in the supply pipe based on the measurement value fed back to the 2 nd control valve.
9. The apparatus for producing expanded particles according to claim 8, wherein,
the apparatus for producing foamed particles has a temperature indicating regulator (TIC) connected to the 2 nd control valve and to which data of a set temperature in the foaming tank is given, and measures temperature data in the foaming tank,
the temperature indication regulator controls the valve opening of the 2 nd control valve by PID control based on two signals of the data of the set temperature and the measured temperature data so that the temperature in the foaming tank becomes the set temperature.
10. The apparatus for producing expanded particles according to claim 9, wherein,
the pressure reducing valve pressure control unit sets the set pressure of the 2 nd pressure reducing valve to 1 st to 3 rd set pressures, and regarding the magnitude of each pressure, the 1 st set pressure > the 2 nd set pressure > the 3 rd set pressure,
the pressure control unit of the pressure reducing valve performs the following steps:
(1) controlling the 2 nd pressure reducing valve so that the pressure of the steam flowing in the supply pipe becomes the 1 st set pressure,
(2) controlling the 2 nd pressure reducing valve so that the pressure of the steam flowing through the supply pipe becomes the 2 nd set pressure after the temperature in the bubbling tank reaches the 1 st set temperature,
(3) after the temperature in the foaming tank reaches a 2 nd set temperature from a 1 st set temperature, controlling the 2 nd pressure reducing valve so that the pressure of the steam flowing through the supply pipe becomes the 3 rd set pressure and the temperature in the foaming tank reaches a target 3 rd set temperature,
based on a graph of the relationship between the time from the step (1) to the step (3) and the set temperature in the foaming tank, the temperature indication regulator (TIC) is given a set value of the temperature in the foaming tank in the following manner:
in the range between the 1 st set temperature and the 2 nd set temperature, the set value of the temperature in the foaming tank is represented by two fold lines having different internal temperature rise speeds,
in the range between the 2 nd set temperature and the 3 rd set temperature, the set value of the temperature in the foaming tank is expressed as a straight line from the 2 nd set temperature to the 3 rd set temperature.
11. A method for producing expanded beads, which uses a production apparatus,
the manufacturing apparatus includes:
a foaming tank;
a sheath portion provided on an outer peripheral portion of the foaming tank; and
a temperature adjustment control unit having a supply pipe for supplying steam to the sheath unit and adjusting the temperature in the foaming tank,
the temperature adjustment control unit includes:
a 1 st pressure reducing valve for keeping a pressure of the steam supplied to the sheath part constant;
a plurality of branch pipes branching from a downstream side of the 1 st pressure reducing valve, the branch pipes having different amounts of vapor supplied; and
a 1 st control valve provided in at least one of the plurality of branch pipes,
in the method for producing the expanded beads,
switching of opening and closing of the plurality of branch pipes is controlled, and the 1 st control valve is used to adjust the amount of vapor in the branch pipe provided with the 1 st control valve.
12. A method for producing expanded beads, which uses a production apparatus,
the manufacturing apparatus includes:
a foaming tank;
a sheath portion provided on an outer peripheral portion of the foaming tank;
a temperature adjustment control unit having a supply pipe for supplying steam to the sheath unit and adjusting the temperature in the foaming tank,
the temperature adjustment control unit includes:
a 2 nd pressure reducing valve provided in the supply pipe, for reducing a pressure of the vapor supplied from the vapor supply source on the upstream side, and supplying the vapor to the downstream side; and
a 2 nd control valve provided on the supply pipe on a downstream side of the 2 nd pressure reducing valve,
in the method for producing the expanded beads,
the 2 nd pressure reducing valve is controlled to increase or decrease the pressure of the steam flowing through the supply pipe, and the 2 nd control valve is used to adjust the flow rate of the steam to be supplied to the sheath portion.
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| JP2019-158794 | 2019-08-30 | ||
| JP2019158794A JP7372083B2 (en) | 2019-08-30 | 2019-08-30 | Expanded particle manufacturing device and manufacturing method |
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| CN112440403B CN112440403B (en) | 2023-03-21 |
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| KR102725562B1 (en) * | 2021-12-30 | 2024-11-04 | 주식회사 이에프솔루션 | Autoclave foamed particle discharge valve system for the production of random polypropylene foamed particles |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP7372083B2 (en) | 2023-10-31 |
| CN112440403B (en) | 2023-03-21 |
| JP2021037635A (en) | 2021-03-11 |
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